Campus Livre
keys
Returns the keys of a containers.Map or dictionary.
Category: Language Fundamentals > Data Types
Syntax
k = keys(M)Returns the keys of the map M.
Description
The keys of a containers.Map always come back sorted, no matter in what order they were added. Use values(M) to get the matching values in the same order. To loop over a map, iterate over keys(M) and index with each key.
Input arguments
M- A
containers.Mapor adictionary.
Output arguments
k- For a
containers.Map, a 1-by-n cell array sorted by key (alphabetically for text, numerically for numbers). For adictionary, an array of the key type in insertion order.
Example
Sorted keys of a map
m = containers.Map({'b', 'a', 'c'}, [2 1 3]);
k = keys(m)
values(m)Output
k = 1×3 cell
{'a'} {'b'} {'c'}
ans = 1×3 cell
{[1]} {[2]} {[3]}